title: Effect of restoration technique on stress distribution in roots with flared canals: an FEA study.
abstract: OBJECTIVE
  The aim of this finite element analysis (FEA) study was to test the effect of different restorative techniques on stress distribution in roots with flared canals.
  
  
  METHODS
  Five three-dimensional (3D) FEA models that simulated a maxillary incisor with excessive structure loss and flared root canals were created and restored with the following techniques/materials: 1) a prefabricated post: 2) one main and two accessory posts; 3) i-TFC post-core (Sun Medical); 4) the thickness of the root was increased by using composite resin and the root was then restored using a prefabricated post; 5) an anatomic post was created by using composite resin and a prefabricated glass-fiber post. Composite cores and ceramic crowns were created. A 300-N static load was applied at the center of the palatal surface of the tooth to calculate stress distributions. SolidWorks/Cosmosworks structural analysis programs were used for FEA analysis.
  
  
  RESULTS
  The analysis of the von Mises and tensile stress values revealed that prefabricated post, accessory post, and i-TFC post systems showed similar stress distributions. They all showed high stress areas at the buccal side of the root (3.67 MPa) and in the cervical region of the root (> 3.67 MPa) as well as low stress accumulation within the post space (0 to 1 MPa). The anatomic post kept the stress within its body and directed less stress towards the remaining tooth structure.
  
  
  CONCLUSIONS
  The creation of an anatomic post may save the remaining tooth structure in roots with flared canals by reducing the stress levels.
authors.forename: Sema
authors.initials: S
authors.lastname: Belli
authors.forename: Öznur
authors.initials: Ö
authors.lastname: Eraslan
authors.forename: Oğuz
authors.initials: O
authors.lastname: Eraslan
authors.forename: Gürcan
authors.initials: G
authors.lastname: Eskitaşcıoğlu
mesh_terms: D001696:Biomechanical Phenomena; D002516:Ceramics / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D003198:Computer Simulation; D003442:Crowns; D003764:Dental Materials / Q000737:chemistry; D003776:Dental Porcelain / Q000737:chemistry; D017267:Dental Prosthesis Design; D003786:Dental Pulp Cavity / Q000473:pathology*; D003799:Dental Stress Analysis; D003804:Dentin / Q000473:pathology; D055119:Elastic Modulus; D020342:Finite Element Analysis; D005898:Glass / Q000737:chemistry; D006171:Gutta-Percha / Q000737:chemistry; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D007180:Incisor / Q000473:pathology; D008954:Models, Biological; D011176:Post and Core Technique / Q000295:instrumentation; D019279:Resin Cements / Q000737:chemistry; D012387:Root Canal Filling Materials / Q000737:chemistry; D018915:Root Canal Preparation / Q000379:methods*; D013314:Stress, Mechanical
chemical_list: D003188:Composite Resins; D003764:Dental Materials; C508050:IPS e.max Press; D019279:Resin Cements; D012387:Root Canal Filling Materials; C009753:fiberglass; D003776:Dental Porcelain; D006171:Gutta-Percha